So... I still go to school.
My English teacher (I'm from Germany) wanted to watch a video with us. There was one Problem. The sound didnt work. My teacher asked for computer Freaks in class. All pointed to me. I went to the desk where the computer was standing.

They plugged the audio output cable for the speakers into the audio input of the computer (that pink microphone input)... 😥 it made some nice sounds haha

Funny thing: other teachers didnt solve the problem before me